In a recent opinion, the Ninth Circuit held that selective enforcement claims in reverse stash-house sting operations are not subject to the nearly impossible-to-surmount discovery standard set forth in United States v. Armstrong, 517 U.S. 457 (1996). See United States v. Sellers, 16-50061 (9th Cir. 2018), opinion available here.
Chief Federal Public Defender Jon Sands, who posts on the excellent Ninth Circuit Blog, has this summary:
In US v. Sellers, No. 16-50061 (10-15-18) (Nguyen w/Simon; Nguyen concurring; Graber dissenting), the panel majority held that in stash house reverse-sting cases, claims of selective enforcement are governed by a less rigorous standard than that applied to claims of selective prosecution under US v. Armstrong, 517 US 456 (1996). The 9th emphasizes the difference between selective prosecution and selective enforcement (9). The 9th stresses that the police do not enjoy the enforcement presumption of prosecutors and …